Holder for thermionic valves



Feb. 14, 1950 G. CLARK 2,497,811

HOLDER FOR THERMIONIC VALVES Filed July 3, 1945 Invewior: Gag fray Wz'ZZz'am C'Zark Patented Feb. 14, 1950 HOLDER FOR THERMIONIC VALVES Geofirey William Clark, Brameote, England, as-

signor to United-Carr Fastener Corporation,

Cambridge, Mass.

Application July 3, 1945, Serial No. 603,034 In Great Britain January 4, 1945 2 Claims.

The present invention relates to holders for thermionic valves, plugs or like electrical devices and more particularly to holders of the type formed by a single or a series of superposed sheets of insulating material.

According to the present invention the single sheet, or the upper of a series of sheets forming the holder, is provided with slots in which are inserted wall portions of insulating material arranged to extend between the contacts of the holder and projects from one or both faces of the sheet. These wall portions serve as screens between adjacent contacts and increase the resistance path between them.

The wall portions may comprise substantially T-shaped strips or blocks of sheet insulating material inserted into slots in the sheet of the holder and formed with an abutment adapted to engage one face of the sheet.

To enable the invention to be fully understood it will now be described with reference to the accompanying drawings, in which:

Fig. 1 is a plan view of one form of valve holder embodying the invention, the usual electrical socket contacts being omitted, and

Fig. 2 is a section on the line 2--2 of Fig. 1.

As shewn in the accompanying drawings, the holder is of the type used for rectifier valves and comprises a single sheet I of insulating material formed with apertures 2 to accommodate electrical socket contacts (not shewn) adapted to receive the terminal pins of a valve. The sheet I has rectangular slots 3 in which are inserted blanks of insulating material which are adapted to serve as screens between adjacent contacts and increase the resistance path between them.

As shewn particularly in Fig. 2, the blanks are substantially T-shaped and when inserted in the slots 3 the cross piece 4 rests on the upper face of the sheet I, and the upright 5 extends through the slot and projects below the underface of the sheet I. The arms of the cross piece 4 form abutments preventing the complete passage of the blank through the slots and the cross piece as a whole, and the uprights 5 form insulating walls between adjacent contacts of the holder on the upper and lower faces of the holder respectively.

In the case of holders comprising two or more superposed sheets, the insulating blanks or strips may be inserted in aligned slots in two or more of the sheets and extend between the adjacent faces of the sheets. The blanks may extend through all the superposed sheets and the ends project from the faces of the upper and lower sheets.

The upright portions 5 may form a force fit in the slots 3 or may be secured by any other suitable means.

The invention is applicable to holders comprising a single sheet of insulating material, such as described above but is also applicable to holders comprising two or more sheets for other types of valves or plugs having projecting terminal pins.

The dimensions of the screening strips or blanks may be varied according to the degree of screening to be eifected to prevent shorting across the contacts.

I claim:

1. A holder for thermionic valves, plugs and like electrical devices including a body composed of one or more sheets of insulating material and having openings for contact elements, said body having rectangular slots between said openings and wall portions of insulating material extending through said slots and having portions thereof extending beyond both faces of said body.

2. A holder for thermionic valves, plugs and like electrical devices including a body composed of one or more sheets of insulating material, said body having openings for contact elements and rectangular slots disposed between said openings extending from the upper face of said body through the lower face thereof, said slots having their sides adjacent said openings and their outer ends disposed within the peripheral edge of said body and their other ends disposed adjacent the center of said body, and wall portions of insulating material secured in said slots, each of said wall portions having an element extending into one of said slots on the upper face of said body and projecting beyond the lower face, and each wall portion having an element disposed in abutting relation with the upper face of said body.

GEOFFREY WILLIAM CLARK.

' file of this patent:

UNITED STATES PATENTS Number Name Date 1,693,303 Mackintosh Nov. 27, 1928 1,937,322 Johnson Nov. 28, 1933 1,973,248 Evans Sept. 11, 1934 2,120,630 Seever June 14, 1938 2,319,728 Eby May 18, 1943 2,376,625 Schmitt May 22, 1945 FOREIGN PATENTS Number Country Date 189,339 Great Britain Nov. 30, 1922 262,226 Great Britain Dec. 9, 1926 375,332 Great Britian June 24, 1932 

